/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections;
using System.Reflection.Emit;
using Spring.Proxy;

namespace Spring.Aop.Framework.DynamicProxy;

/// <summary>
/// Base class for proxy builders that can be used
/// to create an AOP proxy for any object.
/// </summary>
/// <author>Bruno Baia</author>
public abstract class AbstractAopProxyTypeBuilder :
    AbstractProxyTypeBuilder, IAopProxyTypeGenerator
{
    /// <summary>
    /// Generates the IL instructions that pushes
    /// the target instance on which calls should be delegated to.
    /// </summary>
    /// <param name="il">The IL generator to use.</param>
    public override void PushTarget(ILGenerator il)
    {
        PushAdvisedProxy(il);
        il.Emit(OpCodes.Ldfld, References.TargetSourceField);
        il.EmitCall(OpCodes.Callvirt, References.GetTargetMethod, null);
    }

    /// <summary>
    /// Generates the IL instructions that pushes
    /// the current <see cref="Spring.Aop.Framework.DynamicProxy.AdvisedProxy"/>
    /// instance on stack.
    /// </summary>
    /// <param name="il">The IL generator to use.</param>
    public abstract void PushAdvisedProxy(ILGenerator il);

    /// <inheritdoc />
    protected override IList GetTypeAttributes(Type type)
    {
        IList attrs = base.GetTypeAttributes(type);
        int i = 0;
        while (i < attrs.Count)
        {
            if (IsAttributeMatchingType(attrs[i], typeof(SerializableAttribute)))
            {
                attrs.RemoveAt(i);
            }
            else
            {
                i++;
            }
        }

        return attrs;
    }
}
